{"id":20666,"date":"2019-10-24T13:35:09","date_gmt":"2019-10-24T13:35:09","guid":{"rendered":"https:\/\/services.jacobi.net\/nickel-removal-from-water-with-ion-exchange-resins\/"},"modified":"2025-06-05T10:52:46","modified_gmt":"2025-06-05T10:52:46","slug":"rimozione-del-nichel-dall-acqua-con-resine-a-scambio-ionico","status":"publish","type":"post","link":"https:\/\/services.jacobi.net\/it\/rimozione-del-nichel-dall-acqua-con-resine-a-scambio-ionico\/","title":{"rendered":"Rimozione del nichel (Ni\u00b2\u207a) dall’acqua con resine chelanti."},"content":{"rendered":"\t\t
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Da dove viene il nichel?<\/h3>

Il nichel puro (Ni) \u00e8 un metallo bianco-argento che raramente si trova puro in natura poich\u00e8 si ossida a contatto con l\u2019ossigeno. Il nichel puro si trova all\u2019interno di grandi meteoriti composti da nichel-ferro, perch\u00e8 non sono esposti all\u2019ossigeno prima di entrare in contatto con l\u2019atmosfera terrestre, o nelle rocce ultrafemiche.<\/p>

Il nichel viene estratto principalmente da due gruppi di minerali. Il primo gruppo include le lateriti come la limonite (Fe,Ni)O(OH), una miscela nichel-ferrosa, o la garnierite, una miscela di vari silicati ricchi di nichel e nichel idrato. Nel secondo gruppo troviamo i minerali solforati in cui il minerale minerale principale \u00e8 la pentlandite [(FeNi)\u2089S\u2088].<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Tabella 1: Minerali di nichel pi\u00f9 comuni<\/em><\/p>

Lateriti \u00a0<\/strong><\/p><\/td>

Minerali solforati \u00a0<\/strong><\/p><\/td><\/tr>

Limonite\u00a0<\/strong><\/p><\/td>

Garnierite\u00a0<\/strong><\/p><\/td>

Pentlandite\u00a0<\/strong><\/p><\/td><\/tr>

\"\"<\/td>\"\"<\/td>\"\"<\/td><\/tr><\/tbody><\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Il nichel metallico non reagisce con l\u2019ossigeno presente in aria nell\u2019ambiente. Il nichel metallico \u00e8 utilizzato principalmente per la produzione di acciaio inossidabile e leghe di nichel. Il catione di nichel pi\u00f9 comune \u00e8 Ni\u00b2\u207a ma ci sono anche altri stati di ossidazione come Ni\u00b3, Ni \u2074\u207a prodotti per diverse applicazioni.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Come si presenta il nichel nelle acque sotterranee?<\/h3>

Il diagramma di Pourbaix o diagramma di potenziale\/pH nella figura 1 del nichel mostra la speciazione del nichel nell\u2019acqua. L\u2019area tra le linee tratteggiate arancioni rappresenta la zona di stabilit\u00e0 dell\u2019acqua. Il diagramma mostra che la speciazione del nichel nell\u2019acqua \u00e8 dominata dalla sua forma elementare cationica Ni\u00b2\u207a.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Figura 1 Il diagramma di Pourbaix o potenziale\/pH del nichel<\/em><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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La concentrazione di nichel (Ni\u00b2\u207a) nell\u2019acqua in natura \u00e8 generalmente inferiore a 20 ppb (\u00b5g\/l), tuttavia, in un\u2019area contaminata, la concentrazione di nichel nelle acque sotterranee potrebbe essere superiore alle linee guida dell\u2019Organizzazione Mondiale della Sanit\u00e0 (OMS) di 70ppb (\u00b5g\/l).<\/p>

Come viene rimosso il nichel dalle acque sotterranee?<\/h3>

La forma elementare cationica del nichel (Ni\u00b2\u207a) pu\u00f2 essere efficacemente catturata e rimossa dalle acque sotterranee utilizzando una resina chelante selettiva con cationi acidi deboli (WAC) e con un gruppo iminodiacetico, come Resinex\u2122 CH-23.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Figura 2: Una resina chelante selettiva con gruppo iminodiacetico<\/em><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"Nickel-resin\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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La capacit\u00e0 media di rimozione del nichel cationico (Ni\u00b2\u207a) di Resinex\u2122 CH-23 \u00e8 di 20 g di Resinex\u2122 CH-23 per litro di resina, ma \u00e8 importante considerare la composizione dell\u2019acqua da trattare. Spesso l\u2019acqua contiene altri cationi che contribuiscono all\u2019esaurimento del letto di resina; pertanto, raccondiamo sempre di contattare i nostri esperti tecnici che potranno assistere nel dimensionamento del sistema di rimozione dei metalli pesanti pi\u00f9 adatto, poich\u00e9 altri metalli possono influenzare la durata media stimata della resina.<\/p>

Resinex\u2122 CH-23 \u00e8 una resina chelante che rimuove in modo efficiente anche altri cationi di metalli pesanti come, cadmio (Cd\u00b2\u207a), rame (Cu\u00b2\u207a), piombo (Pb\u00b2\u207a), vanadio (Va\u00b2\u207a) e zinco (Zn\u00b2\u207a) nella loro forma cationica elementare.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Condizioni operative raccomandate per la rimozione del nichel (Ni\u00b2\u207a)<\/h3>

La scelta delle condizioni di funzionamento di un sistema di rimozione del nichel dipende dai seguenti fattori:<\/p>

  • Il tempo minimo di contatto superficiale necessario per il corretto funzionamento<\/li>
  • Altre specie cationiche nell\u2019acqua<\/li>
  • Durata del letto di resina desiderata<\/li>
  • Condizioni operative (continue, discontinue)<\/li><\/ul>

    Il filtro mobile AquaFlow\u2122 p\u00f9\u00f2 essere impiegato per la rimozione del nichel (Ni\u00b2\u207a) con un tempo di contatto superficiale di almeno sei minuti, ma di solito raccomandiamo di impiegare due filtri mobili AquaFlow\u2122 in serie, ottenendo cos\u00ec una portata media di 10- 20 BV\/h.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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    Come calcolare la rimozione del nichel (Ni\u00b2\u207a) dalle acque sotterranee<\/h3>

    Si ipotizzi una falda acquifera contaminata con 0,3 mg\/l di nichel (Ni\u00b2\u207a) da purificare avente le seguenti propriet\u00e0:<\/p>

    • Portata media di 30m\u00b3\/h<\/li>
    • Funzionamento continuo 24\/24 -7\/7<\/li><\/ul>

      Il carico annuale di nichel (Ni\u00b2\u207a) viene quindi calcolato come segue:<\/p>

      • Concentrazione di nichel: 0,3mg\/l = 0,3g\/m\u00b3<\/li>
      • Volume annuale di nichel (Ni\u00b2\u207a) nell\u2019acqua freatica contaminata: 30m\u00b3\/h x 8.600hpa= 258.000 m\u00b3<\/li>
      • Il carico annuale di nichel (Ni\u00b2\u207a): 3g\/m\u00b3 x 258,000m\u00b3= 77,400g = 77,4kg Ni\u00b2\u207a<\/li><\/ul>

        Ne risulta un carico medio di 20kg Ni\u00b2\u207a\/m\u00b3 per Resinex\u2122 CH-23 ed un consumo stimato di circa 4m\u00b3 all\u2019anno. Per ottenere la frequenza di scambio desiderata, Resinex CH-23 pu\u00f2 essere utilizzata con il filtro mobile AquaFlow\u2122, parte della nostra gamma di filtri mobili industriali.<\/p>

        Raccomandiamo di contattare i nostri esperti tecnici per il corretto dimensionamento del sistema di rimozione dei metalli pesanti, in quanto altri metalli possono influenzare la durata media stimata della resina.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

        Da dove viene il nichel? Il nichel puro (Ni) \u00e8 un metallo bianco-argento che raramente si trova puro in natura poich\u00e8 si ossida a contatto con l\u2019ossigeno. Il nichel puro si trova all\u2019interno di grandi meteoriti composti da nichel-ferro, perch\u00e8 non sono esposti all\u2019ossigeno prima di entrare in contatto con l\u2019atmosfera terrestre, o nelle rocce…<\/p>\n","protected":false},"author":32,"featured_media":39418,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[3681],"tags":[],"class_list":["post-20666","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-trattamento-delle-acque-it"],"acf":[],"yoast_head":"\nRimozione del nichel (Ni\u00b2\u207a) dall'acqua con resine chelanti. | Jacobi Services<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/services.jacobi.net\/it\/rimozione-del-nichel-dall-acqua-con-resine-a-scambio-ionico\/\" \/>\n<meta property=\"og:locale\" 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